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We must do something to protect the earth,     we will lose our home.A. and B. or C. so D. but

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nobody    nothing    somebody    something  
must is done    must be done    must do    must done  
better and better    much better   worse and worse    bad and bad  
should do    must do   must have done    ought to have done  
pouring    to pour    poured    being poured  
However life is difficult    However is life difficult    However difficult life is    However difficult is life  
dangerous    a danger    in danger    dangerous one  
stop… from polluted    keep…being polluted    prevent… being polluted    stop…from polluting  
to be polluted    from polluting    off being polluted    being polluted  
Yes, we can    No, we can’t    Yes, we must    No, we needn’t  
take measures    do some work    do something    make some rules  
in need    in need of    in the need    in need of need  
must is done    must be done    must do    must done  
dirty  better  worse  more better  
ought to have done    must do   must have done    had to do  
so    and    but    though